1 On Experiment 6, how a Helmholtz coil and a magnetic bar are used to measure Earth's magnetic field - B(Earth)? a. The coil generates a magnetic field on the bar that cancels Earth's field. b. Placing the coil perpendicular to Earth's magnetic field, it generates a cross field that diverts the magnet bar. C. By aligning B(coil) and B(Earth), and varying B(coil), it is possible to create a curve that allows a more accurate measure of B(Earth) than if it was measured alone d. B(coil) alters B(Earth) through the magnetic bar oscillation